FAPI: Fix usage of external PEM keys for PolicyAuthorize. #2136

Job	Run time
scanbuild	6m 34s
coverity-test	0s
build-test (ubuntu-20.04, gcc)	4m 31s
build-test (ubuntu-20.04, clang)	4m 17s
test-coverage	5m 27s
build-test (fedora-32, gcc)	4m 41s
test-mbedtls (ubuntu-20.04)	2m 51s
test-fuzz	2m 29s
build-test (fedora-32, clang)	5m 1s
test-mbedtls (ubuntu-22.04-mbedtls-3.1)	2m 54s
build-test (opensuse-leap, gcc)	4m 30s
test-no-crypto-build	1m 30s
build-test (opensuse-leap, clang)	4m 50s
test-tcti-config	14m 22s
build-test (ubuntu-22.04, gcc)	4m 24s
build-test (ubuntu-22.04, clang)	4m 34s
build-test (alpine-3.15, gcc)	3m 54s
build-test (alpine-3.15, clang)	4m 53s
	1h 21m 42s

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